Is it cheaper to back up Azure VMs using a private endpoint or over the internet?

In my experience, I’d usually lean toward using the internet unless there are specific reasons to go with PEP. The egress charges for a private endpoint can add up, especially at that scale with 100 TB. Just make sure your internet can support the load!

That's an interesting question! Generally, using a private endpoint (PEP) can add costs that could offset any savings you think you might have. Even if the data transfer happens within the data center, you'll still incur charges for ingress with PEP, especially if you're using ExpressRoute for the backup. So, in some cases, backing up over the internet might actually be the more economical option if your internet can handle it.

It really depends on where your data is coming from. If your VMs are also in Azure, going with a private endpoint might work, but you need to consider the whole ingress path. If they're on-prem or in another cloud, that could change things. Always check the specific costs for data transfer in your scenario!